View of Engineer Mountain and North and South Engineer (Yvonne) Pass in Ouray County or Hinsdale County, Colorado. Shows a barren mountain landscape with patches of snow. A dirt road and an abandoned mine are in the distance.

A large crowd is seated in the operating gallery of the Moffat Filter Plant in Lakewood (Jefferson County), Colorado. Mayor Benjamin Stapleton addresses the crowd using a microphone that is labeled with the letters: "K.O.A." Other dignitaries...

Head, shoulders and chest portrait of Major General Grenville M. Dodge, shows the commander with a full beard wearing a military issue double breasted winter coat, a bow tie and hat. Dodge was a civil and military engineer and Chief Engineer of the...

View of a flatbed truck parked near the Tivoli Student Union (formerly the Tivoli-Union Brewery), located at 900 Auraria Parkway on the Auraria Higher Education Center campus in Denver, Colorado. The brewery was built in 1881, with subsequent...

View of the Happy Valley Placer Co. mining camp in the Grand Island Mining District, Boulder County, Colorado with tents and a buggy. John H. Kemp leans on the fence to the left; Engineer August Mathez stands with a transit instrument and tripod...

Two Colorado School of Mines students compete in a hand drilling contest with a mallet and wedge or spike on a stone block on Engineer's Day, in Golden, Jefferson County, Colorado. Mike Lacy is on the left in a plaid shirt; spectators look on. One...

Two Colorado School of Mines students compete in a hand drilling contest with a hydraulic drill on a large stone block during Engineer's Day, Golden, Jefferson County, Colorado. Foothills are in the background.

Group portrait of members of the Brotherhood of Locomotive Engineers at the 26th Annual Convention in Denver, Colorado. The men are identified as : "W.E. Devine, Alex Davidson, W.W. Hall [engineer for Denver, South Park, and Pacific Railroad], Ed....

This two-story brick school in Holyoke, Phillips County, Colorado, has a hipped gable roof, a projecting, pedimented entry, and stone sills. Steps lead to the door, flanked by windows with stone voussoirs, and topped by a sign: "High School." Vents...

Studio portrait William P. Jones, Chief Engineer of the Denver Board of Public Works (1899-1901), Denver, Colorado. He wears a jacket, a shirt with an upright, wing collar and a necktie. His wavy hair is parted on the side and combed into a...

The newly-completed high school in Eagle, Colorado, is a two- story brick building by John J. Huddard, architect and engineer; textured decorative panels are between the first- and second-story double-hung windows, stairs lead to the central...

Men sit on rocks beside a tent and horses at a camp on a snow-covered mountain probably in the Cascade Mountains (Siskiyou County), California. Steam from possibly a geothermic vent is on the mountain.

Panoramic view of foothills and probably a river valley near the Cascade Mountains in Siskiyou County, California. Shows trees beside a river and probably an irrigation ditch and a fence on a hillside.

Panoramic view of a survey camp beside the Snake River at Shoshone Falls, a waterfall in Twin Falls County, Idaho. Men stand or sit on boulders beside a transit and tripod or near a canvas tent, above the Snake River. Camp equipment and supplies...

Panoramic view of a survey camp beside the Snake River at Shoshone Falls, a waterfall, (Twin Falls County), Idaho. Men stand or sit beside boulders and a canvas tent on a hill above the river. One man uses a transit and tripod. Camp equipment and...

Aerial view of steep canyon walls and towers of a canyon below Shoshone Falls in Twin Falls County, Idaho. Shows trees on talus slopes and fallen timber washed up beside boulders at the edge of the Snake River.

A man wears a hat and jacket, a holster and a pistol and sits on a rock above Shoshone Falls on the Snake River in Twin Falls County, Idaho. Shows steep rock cliffs, boulders in the river, and several waterfalls in a canyon.

View of Shoshone Falls, a waterfall on the Snake River (Twin Falls County), Idaho. Shows rocky slopes or towers in the river and canyon walls of a canyon. Fallen timber is scattered among boulders on the shore.

A man identified as George Hughes poses near a headframe and shaft house at the Boncarbo mine in Sarcillo Canyon (Las Animas County), Colorado. The shaft house is constructed from corrugated tin. The headframe is made of iron beams. Hughes wears a...

Men, who include Bob Barr, the engineer, pose on and near Chicago & North Western locomotive number 133 and its tender in Clinton (Clinton County), Iowa. Letters on the Locomotive cab read: "C. &. N. W. R." A horse-drawn carriage, buildings and...